Sofa



FIG. 1 is a top plan view of a sofa showing the design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a right side elevational view thereof; and,

FIG. 6 is a left side elevational view thereof.

A sofa showing the claimed design is seen in FIGS. 1-6 . Although not depicted in the drawing figures, a sofa showing the claimed design is preferably black in color, with the exception of white “piano keys” on the sitting surface of the sofa. 

The ornamental design for a sofa, as shown and described. 